Oracle Linux/Common Tools

Common Tools

Listening Ports

netstat

~$ netstat -lnp
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 127.0.0.1:17003         0.0.0.0:*               LISTEN      -
tcp        0      0 127.0.0.1:40333         0.0.0.0:*               LISTEN      -
udp    42240      0 127.0.0.1:8125          0.0.0.0:*                           -
udp    32256      0 169.254.0.2:53          0.0.0.0:*                           -

process activity

top

~$ top

LoadAvg Load average over 1, 5, and 15 minutes. divide by number of cores to determine load.

ps

ps -AlH

This shows all the processes running, in long format, with the extra full format output

Network Throughput

iperf

requires a server/client setup that communicates over port 5001. generally server/client placement is dependent on network accessibility, ie. server would be placed outside of the network, client within. You may need to open 5001 on both sides however, in case established/related is not implicitly accepted from the client side > out.

Server side

~$ sudo yum install -y iperf
sudo iptables -A INPUT -p tcp --dport 5001 -j ACCEPT -m comment --comment "iperf - 5001"
~$ iperf -s

Example:

$ iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 10.0.0.1 port 5001 connected with 10.0.0.2 port 47552
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec  76.6 MBytes  64.1 Mbits/sec
[  5] local 10.0.0.1 port 5001 connected with 10.0.0.2 port 39914
[  5]  0.0-10.0 sec  84.5 MBytes  70.6 Mbits/sec

Client side

~$ iperf -c target.ip -p port.number

Example

$ iperf -c 10.0.0.1 -p 5001
------------------------------------------------------------
Client connecting to 10.0.0.1, TCP port 5001
TCP window size:  466 KByte (default)
------------------------------------------------------------
[  3] local 10.0.0.1 port 39914 connected with 10.0.0.2 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  84.5 MBytes  70.8 Mbits/sec

Disk

lsblk

Shows a list of block devices. Useful in showing mount points, size, name, etc.

~$ lsblk --all
NAME                        MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
loop0                         7:0    0        0 loop
loop1                         7:1    0        0 loop
loop2                         7:2    0        0 loop
loop3                         7:3    0        0 loop
loop4                         7:4    0        0 loop
loop5                         7:5    0        0 loop
loop6                         7:6    0        0 loop
loop7                         7:7    0        0 loop
sr0                          11:0    1 1024M  0 rom
sda                           8:0    0    8G  0 disk
├─sda1                        8:1    0  500M  0 part /boot
└─sda2                        8:2    0  7.5G  0 part
  ├─VolGroup-lv_root (dm-0) 253:0    0  6.7G  0 lvm  /
  └─VolGroup-lv_swap (dm-1) 253:1    0  816M  0 lvm  [SWAP]

fdisk

Tool for showing partitions and disks, as well as other things

~$ sudo fdisk -l

Disk /dev/sda: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000091fd

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64        1045     7875584   8e  Linux LVM

Disk /dev/mapper/VolGroup-lv_root: 7205 MB, 7205814272 bytes
255 heads, 63 sectors/track, 876 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000


Disk /dev/mapper/VolGroup-lv_swap: 855 MB, 855638016 bytes
255 heads, 63 sectors/track, 104 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

df

shows the amount of disk space on the file system. Can also show inodes.

~$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
                      6.5G  1.7G  4.5G  28% /
tmpfs                 499M     0  499M   0% /dev/shm
/dev/sda1             477M   52M  400M  12% /boot

du

shows the amount of space used from a specific directory and recursively includes its children.

~$ du -h /home/user/temp
4.0K	/home/user/temp

local mounts and file systems

~$ sudo cat /proc/mounts
rootfs / rootfs rw 0 0
proc /proc proc rw,relatime 0 0
sysfs /sys sysfs rw,seclabel,relatime 0 0
devtmpfs /dev devtmpfs rw,seclabel,relatime,size=499208k,nr_inodes=124802,mode=755 0 0
devpts /dev/pts devpts rw,seclabel,relatime,gid=5,mode=620,ptmxmode=000 0 0
tmpfs /dev/shm tmpfs rw,seclabel,relatime 0 0
/dev/mapper/VolGroup-lv_root / ext4 rw,seclabel,relatime,barrier=1,data=ordered 0 0
none /selinux selinuxfs rw,relatime 0 0
devtmpfs /dev devtmpfs rw,seclabel,relatime,size=499208k,nr_inodes=124802,mode=755 0 0
/proc/bus/usb /proc/bus/usb usbfs rw,relatime 0 0
/dev/sda1 /boot ext4 rw,seclabel,relatime,barrier=1,data=ordered 0 0
none /proc/sys/fs/binfmt_misc binfmt_misc rw,relatime 0 0